Abstract: A cartridge is used in a fluid treatment system. The cartridge may comprise a water insoluble container having holes on at least two surfaces of the container; a solid liquid treatment material within the container that can be exposed to water entering said holes; and a strippable film covering said holes. The fluid treatment system may comprise a housing with an S-Tube fluid exhaust outlet of have a securable cover with a floating retainer or neck collar.

Abstract: A fluid treatment device adapted to be disposed in-line with a fluid flow path, particularly suited for use as an in-line toilet cleaner. The device is suitable for use with fluid pressures of at least 500 pounds per square inch. The device includes inlet and outlet ports for connection to a fluid supply and a fluid exhaust. The device has a fluid treatment chamber for use with a replaceable fluid treatment cartridge inserted therein. The fluid treatment cartridge may be a chemical compound such as a detergent, or a mechanical or electrical treatment device. The device also includes a valve mechanism for controlling the portion of fluid that passes through the treatment chamber before exiting the device, and an adjusting knob for manipulating the valve position. The device has a pressure release valve. The device may include an indicator for indicating when the treatment cartridge must be replaced.